The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 18, 1980
Filed:
May. 17, 1978
Applicant:
Inventors:
David Brankling, Hull, GB;
John Crawford, Hornsea, GB;
Assignee:
Orobis Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C10M / ;
U.S. Cl.
CPC ...
585 11 ; 585 12 ; 585 13 ;
Abstract
A viscosity index improver additive composition contains, as one component, a vinyl aromatic/conjugated diene polymer of specific structure and composition and, as a second component an ethylene/C.sub.3 to C.sub.18 alpha olefin copolymer of specific composition and viscosity. Preferably the composition also contains a polybutene of defined molecular weight.